通过串口传输文件 说明：压缩文件并通过串口传送 要求：1M以下文件-through the serial port to transfer files : compressed files through serial transmission requirements : 1M following documents

看门狗，初始化串口 ，系统时钟初始化 ，使能中断 ，MCLK 8M and SMCLK 1M-Watchdog, initialize the serial port, the system clock is initialized to interrupt, MCLK 8M and SMCLK 1M